If the question does not specify if a test is one or two tailed and let’s say the significance level is 5% do you interpret the question as rejecting the null if the p value is less than 5% or less than 2.5%?
I think 5%
if p value is greater than level of significance then accept the null and if p value is less than level of significance then accept the alternate… i hope this helps
It’s 5%. A particular p value does not correspond to the same z values for one or two-tailed tests. Otherwise stated, different z values for one and two-tailed tests are needed to produce the same p value.
The question will always specify whether the test is one-tail or two-tail, you just have to know how to interpret the question. The key is that if the question says “Does the data indicate that the mean is different from 5?” this is a two-tail test. If it says “Does the data indicate that the mean is greater than 5?” or “Does the data indicate that the mean is less than 5?” then it is a 1-tail test. All F-tests are 1-tail tests. All chi-square tests are 1-tail.
you never “accept the null hypothesis” or “accept the alternate hypothesis”. you either reject or fail to reject the null hypothesis. if you are able to reject the null then by default the alternate is almost certainly true
srry ma bad…
huh? we reject Ho if p value is lower than the level of significance (1-confidence level)